Through which clause did state governments become bound by the Bill of Rights?

The correct answer is C. the due process clause.

The Due Process Clause, found in the Fourteenth Amendment, has been interpreted by the Supreme Court to extend certain protections of the Bill of Rights to apply to state governments. This means that states cannot infringe on citizens’ rights that are guaranteed by the Bill of Rights, thus “binding” them by these protections. If you have more questions about this topic, feel free to ask or check the extended services page for further assistance!